A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs

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Few South American macrofloras of Paleocene age are known, and this limits our knowledge of diversity and composition between the end-Cretaceous event and the Eocene appearance of high floral diversity. We report new, unbiased collections of 2516 compression specimens from the Paleocene Salamanca Fo...

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Autores principales: Iglesias, Ari, Wilf, Peter, Johnson, Kirk R., Zamuner, Alba Berta, Cúneo, N. Rubén, Matheos, Sergio Daniel, Singer, Bradley S.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Ciencias Naturales
Paleocene
Salamanca Formation
plant diversity
Patagonia
South America
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/131923
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-131923
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Paleocene
Salamanca Formation
plant diversity
Patagonia
South America
spellingShingle Ciencias Naturales
Paleocene
Salamanca Formation
plant diversity
Patagonia
South America
Iglesias, Ari
Wilf, Peter
Johnson, Kirk R.
Zamuner, Alba Berta
Cúneo, N. Rubén
Matheos, Sergio Daniel
Singer, Bradley S.
A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs
topic_facet Ciencias Naturales
Paleocene
Salamanca Formation
plant diversity
Patagonia
South America
description Few South American macrofloras of Paleocene age are known, and this limits our knowledge of diversity and composition between the end-Cretaceous event and the Eocene appearance of high floral diversity. We report new, unbiased collections of 2516 compression specimens from the Paleocene Salamanca Formation (ca. 61.7 Ma) from two localities in the Palacio de los Loros exposures in southern Chubut, Patagonia, Argentina. Our samples reveal considerably greater richness than was previously known from the Paleocene of Patagonia, including 36 species of angiosperm leaves as well as angiosperm fruits, flowers, and seeds; ferns; and conifer leaves, cones, and seeds. The floras, which are from siltstone and sandstone channel-fills deposited on low-relief floodplain landscapes in a humid, warm temperate climate, are climatically and paleoenvironmentally comparable to many quantitatively collected Paleocene floras from the Western Interior of North America. Adjusted for sample size, there are >50% more species at each Palacio de los Loros quarry than in any comparable U.S. Paleocene sample. These results indicate more vibrant terrestrial ecosystems in Patagonian than in North American floodplain environments ∼4 m.y. after the end-Cretaceous extinction, and they push back the time line 10 m.y. for the evolution of high floral diversity in South America. The cause of the dis parity is unknown but could involve reduced impact effects because of greater distance from the Chicxulub site, higher latest Cretaceous diversity, or faster recovery or immigration rates.
format Articulo
Articulo
author Iglesias, Ari
Wilf, Peter
Johnson, Kirk R.
Zamuner, Alba Berta
Cúneo, N. Rubén
Matheos, Sergio Daniel
Singer, Bradley S.
author_facet Iglesias, Ari
Wilf, Peter
Johnson, Kirk R.
Zamuner, Alba Berta
Cúneo, N. Rubén
Matheos, Sergio Daniel
Singer, Bradley S.
author_sort Iglesias, Ari
title A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs
title_short A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs
title_full A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs
title_fullStr A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs
title_full_unstemmed A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs
title_sort paleocene lowland macroflora from patagonia reveals significantly greater richness than north american analogs
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/131923
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